検索結果 - Johnson William L.

Aleacin̤ Aleaciones Alloy Alloys Gold Industria metalr͠gica Jewelry Jewelry making Jewelry manufacturing Joyera̕ Manufactura de joyas Materiales Materials Materials engineering Metal trade Metales preciosos Metallic glass Metallurgy Metalurgia Oro Precious metals TecnologƯ̕a de los materiales Vidrio metl̀ico